Multi-axis processing machine and rotation center measurement method of multi-axis processing machine

Abstract

The disclosure is a rotation center measurement method of a multi-axis processing machine which relatively moves tables on which a work piece is placed and a tool for processing the work piece by control of rotation axes based on a processing program, and the rotation center measurement method is characterized to include: a processing program acquisition step in which the processing program is acquired; a processing program analysis step in which command angles of tool postures are read from the processing program and analyzed, and measurement angles are calculated based on the analysis results; and a geometric deviation measurement step in which a reference sphere is placed on the tables and the tables and the tool are relatively moved to measure a position of the reference sphere, and directions and positions of rotation centers of the rotation axes are calculated.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the priority benefits of Japanese application no. 2020-072646, filed on Apr. 15, 2020. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.BACKGROUNDTechnical Field[0002]The disclosure relates to a multi-axis processing machine and a rotation center measurement method of multi-axis processing machine capable of accurately measuring a geometric error of a rotation axis.Related Art[0003]Conventionally, a multi-axis processing machine is known which brings a tool close to an object to be processed (hereinafter referred to as a work piece) from a plurality of angles and processes the object to be processed into a complicated shape. For example, a five-axis processing machine such as a machining center or the like which is configured by three linear axes and two rotation axes includes tables which rotate around an A-axis and a C-axis, and...

AI Technical Summary

Benefits of technology

The patent text describes a method for accurately calculating the positions and directions of rotation centers of a machine used for processing work pieces. This is achieved by analyzing the processing program and calculating the command angles of the tool postures used in the program. The method also involves measuring the deviation of the work piece from a reference sphere using the reference sphere's measurement angles, which are derived from the command angles. By doing so, the method minimizes processing errors and avoids the issue of shifting rotation centers when using the reference sphere. Additionally, the frequency distribution of the command angles is calculated to simplify the accuracy and accuracy of the measurement angles. This method allows for accurate and efficient processing without the need for additional equipment or capital investment. The processing program acquisition and analysis steps are performed on different computers to further shorten the initial setting time before processing the work piece.

Problems solved by technology

In this five-axis processing machine, due to factors such as an error that occurs during assembly, bending due to a weight of the work piece or the rotation axis itself, displacement due to heat of the rotation axis, and the like, a geometric error (a geometric deviation) occurs in positions, directions, or the like of the rotation centers of the rotation axes.

Furthermore, the number of geometric deviations between the axes increases as the number of axes increases, and processing precision of the work piece is greatly affected.

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